EP0645414B1 - Copolymer with magnetic properties, its method of fabrication and its uses - Google Patents

Copolymer with magnetic properties, its method of fabrication and its uses Download PDF

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EP0645414B1
EP0645414B1 EP94402130A EP94402130A EP0645414B1 EP 0645414 B1 EP0645414 B1 EP 0645414B1 EP 94402130 A EP94402130 A EP 94402130A EP 94402130 A EP94402130 A EP 94402130A EP 0645414 B1 EP0645414 B1 EP 0645414B1
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Prior art keywords
copolymer
radical
acid
substituted
manufacture according
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German (de)
French (fr)
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EP0645414A1 (en
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Stanislas Galaj
Alain Le Mehaute
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Nexans SA
Alcatel Lucent SAS
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Alcatel SA
Alcatel Alsthom Compagnie Generale dElectricite
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/42—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of organic or organo-metallic materials, e.g. graphene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/02—Polyamines
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
    • C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
    • C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain

Definitions

  • the present invention relates to a copolymer with magnetic properties with multivalent radicals derived from aminoaromatic compounds. It also extends to its manufacturing process and the applications of this copolymer.
  • EP-0 545 819 describes copolymers with magnetic properties composed of two groups of aminoaromatic compounds, the first of which is based on derivatives by substitution of aniline, the formula of which is:
  • the object of the present invention is to provide a copolymer with magnetic properties, the synthesis is easily achievable on an industrial level.
  • the present invention provides a copolymer with magnetic properties, the pattern of which elementary has a first multivalent radical from of a compound chosen from 1-naphthylamine optionally substituted taken in its reduced or oxidized form, and a second multivalent radical derived from an aminoaromatic compound chosen from a substituted amino compound comprising at least two condensed benzene rings, a polycyclic compound substituted comprising at least the aniline motif in its structure, and an aniline derivative compound carrying a substituent linked to the nucleus by an ethynylidene link or paraphenylene, these compounds being taken in their form reduced or oxidized, said first and said second radical being linked together by a carbon-nitrogen bond and the nitrogen atoms being separated by a single aromatic ring.
  • 1-naphthylamine is also called ⁇ -naphthylamine, naphthyl-1 amine, or even 1-aminonaphthalene. Its formula is:
  • the same radical can be in its oxidized form or in its reduced form, corresponding to the equilibrium
  • a substituted amino compound comprising minus two condensed benzene rings
  • 1-amino-5-bromonaphthalene 1-amino-2-chloronaphthalene
  • N-phenyl-1-naphthylamine N-methyl-N-phenyl-1-naphthylamine
  • 1-amino-2-metoxynaphthalene 1-methylamino-2-metoxynaphthalene, 8-amino-2-metoxynaphthalene, or else again 8-methylamino-2-metoxynaphthalene.
  • a polycyclic compound cf. HANDBOOK of CHEMISTRY and PHYSICS, 1978, page C-19, rule 32-12
  • Such a compound can be by example: 1-amino-5,6,7,8-tetrahydronaphthalene, 1-amino-9-fluorenone, 1- (methylamino) anthraquinone, 1-aminofluorene, 1-aminoanthraquinone.
  • the ferromagnetic copolymers obtained according to the present invention have a density less than 1.5 and therefore the advantage of being lighter than other products ferromagnetics commonly used as metals or ferrites.
  • radical derived from a compound comprising at minus an aromatic nucleus capable of being placed in the main chain a radical capable of forming two bonds between a carbon of the aromatic nucleus and an atom nitrogen.
  • the multivalent radical B is for example a radical of the form:
  • the multivalent radical B is for example a radical of the form:
  • the multivalent radical B is for example a radical of the form:
  • the patterns elementary may have a different number of radicals A and B.
  • the most common configuration desirable is the rigorous alternation of the radicals A and B.
  • X is a multivalent radical derived from a naphthalene core.
  • the radical B is a multivalent radical derived from an acid chosen from CLEVE acids: 8-amino-2-naphthalenesulfonic acid (form ⁇ ) and 5-amino-2-naphthalenesulfonic acid (form ⁇ ), the acid of LAURENT: 1-amino-5-naphthalenesulfonic acid, PERI acid: 1-amino-8-naphthalenesulfonic acid, and the diacids: 1-naphthylamino-5,7-disulfonic acid and 1-naphtylamino-6,8- acid disulfonic.
  • X is a naphthalene ring and Y is a sulfo substituent -SO 3 H.
  • the copolymers according to the invention can be self-doped but in the case on the contrary, they can be doped in order to make them conductive.
  • Conductive copolymers according to the present invention can be used for shielding cables gain flexibility and lightness.
  • radicals A and / or B are found in oxidized form. And preferably, half of radicals B is in the oxidized form and the other half is in the reduced form, this promotes the formation of a salt internal which stabilizes the structure and causes the appearance of ferromagnetism.
  • the second step includes washing the copolymer obtained by a weakly basic solution such as for example a dilute solution of N-methylformamide or ammonia in water, followed by washing with a mixture of water and methanol.
  • a weakly basic solution such as for example a dilute solution of N-methylformamide or ammonia in water
  • the purpose of this step is to remove impurities soluble in the product obtained, and in particular the residues of monomers.
  • the copolymerization is carried out in a chosen acid medium among sulfuric acid, phosphoric acid, acid perchloric, paratoluenesulfonic acid, acid formic, acetic acid and trifluoroacetic acid.
  • the acidic medium may contain a solvent.
  • a dispersant case of a suspension
  • water alcohols such as methanol, ketones like acetone, organic acids like acetic acid or formic acid, and their mixtures.
  • the copolymerization is carried out by slowly adding an oxidizing agent to the suspension or solution containing the mixture of monomers.
  • the oxidizing agent is chosen from hydrogen peroxide H 2 O 2 and iodic acid HIO 3 .
  • the oxidizing agent can be used pure or in solution.
  • said agent oxidant is oxygen gas.
  • the oxidation copolymerization in the presence of an electrode active under power.
  • the electrochemical route allows to adjust the oxidation rate of the copolymer.
  • the copolymerization is carried out by oxidation in the presence of a catalyst which makes it possible to increase the yield of the reaction.
  • the process also includes a third step enrichment in magnetic copolymer of the product obtained at the end of the second stage.
  • a copolymer is extracted from soluble phase by dissolving in basic solvent volatile, then the solution is quickly evaporated in vacuo to obtain a solid residue which is heat treated at about 110 ° C under vacuum to regenerate the properties ferromagnetics of the copolymer.
  • the solvent is anhydrous liquid ammonia.
  • the purpose of the heat treatment is to break the salt bonds which have been created between the basic solvent and the substituent Y of the copolymer, for the benefit of the formation other salt bonds between the substituent Y and the amine and / or imine sites of the copolymer carried by the first radical A.
  • These new salt bonds can be create within the same main chain, or between several chains of the copolymer.
  • the method further includes a third step enrichment in magnetic copolymer of the product obtained at the end of the second stage.
  • a copolymer is extracted from soluble phase by dissolving in basic solvent volatile, then the soluble phase is precipitated by acidifying the solution which causes the ammonium salt to decompose of the copolymer which has formed.
  • the copolymer obtained is mainly amorphous. It comes in the form of a gel the wet state and porous blocks in the dry state. In the middle basic, its color is purplish blue, it becomes dark green in an acid medium.
  • the solvent is a solution of a base volatile in an organic solvent, such as alcoholic ammonia solution.
  • solidification (drying or precipitation) of the soluble phase is carried out under magnetic or / and electric field.
  • the copolymer according to the invention can be used under different shapes. According to a first mode of implementation work, the copolymer is suspended or in solution to form a ferro-fluid. Confined in a field magnetic, it can be used for example as a seal magnetic. It also makes it possible to obtain adhesives.
  • the copolymer carrying a proton donor substrate Y is salified by a bulky base such as tetraalkylammonium hydroxide.
  • a bulky base such as tetraalkylammonium hydroxide. The purpose of this operation is to make the polymer fusible to allow it to be shaped into a thin layer.
  • the thickness of the deposited layer can be extremely small in the nanometer range, which allows its application in various techniques of microscopy: tunnel microscopes, force microscopes atomic, near field microscopes and microscopes with evanescent wave.
  • the copolymer is deposited in several thin layers separated by a layer of a magnetic material different from said copolymer and chosen among a diamagnetic material, a material ferromagnetic, a ferrimagnetic material and a material paramagnetic.
  • copolymers of the invention lend themselves to numerous applications due to their strong properties magnetic. They can be deposited in a thin layer on supports, such as polyethylene, polyvinyl chloride, polymethyl methacrylate, polycarbonates, epoxy resins. As such, they can serve as a support written information, especially for tickets or cards banking, but also as photographic supports or radiographic.
  • copolymers find applications in microwave devices, in particular waveguides, circulators, polarizers, absorbents, shields and filters. They are also suitable in optical systems, including display screens, dichroic, diffraction or absorption systems of X-rays, or multiplexing on optical fibers. So more general they are applicable in systems electro-magneto-optical and electro-magneto-resistive.
  • An adjustment of their magnetic properties is possible allowing their use in devices magnetism control.
  • This adjustment can be made by chemical route using a catalytic structure, via electrochemical, mechanically by means of pressure, in particular using a piezoelectric material, or by thermal route.
  • copolymers can also be used in electrical equipment, such as motors, transformers, inductors, where they allow the use of non-metallic magnetic materials.
  • the separation of the copolymer is obtained by redispersion of the pellet several times in an aqueous mixture of solvents, followed by recovery by centrifugation. Some washes are done in a mixture equivolumique of water and methanol, then we realize at least two washes in a 50% solution of N-methylformamide in a water-methanol mixture, in order to remove the acid 5-amino-2-naphthalenesulfonic. Finally we finish the washes with solvents containing very little water: 25% solution by volume of acetic acid in methanol, diethyloxide.
  • the self-doped conductive copolymer obtained is represented by the general formula:
  • the magnetism measurements are carried out at a temperature of 300K on an alternating field gradient magnetometer.
  • the result is in the form of curve 1 in FIG. 1 which shows the evolution of the magnetization M as a function of the magnetic field H applied to the sample.
  • This curve is characteristic of a ferromagnetic compound and exhibits hysteresis.
  • the magnetization at saturation M s is 0.12 emu / g and the coercive field is of the order of 100 Oersteds.
  • the magnetism measurements are carried out in the same manner as in Example 1. The result is in the form of curve 2 in FIG. 2. This curve is characteristic of a ferromagnetic compound and has hysteresis.
  • the magnetization at saturation M s is 0.07emu / g and the coercive field is of the order of 100 Oersteds.
  • the suspension is then washed and dried as described in example 1 and we get 330mg of a powder almost black, or a yield of the order of 20%.
  • the magnetism measurements are carried out in the same manner as in Example 1.
  • the copolymer obtained is ferromagnetic. Its magnetization at saturation M s is 0.07emu / g and the coercive field is of the order of 100 Oersteds.
  • the suspension is then washed and dried as described in example 1 and we get 65mg of a powder almost black, i.e. a yield of 4% compared to the quantity stoichiometric of the two monomers.
  • the magnetism measurements are carried out in the same manner as in Example 1.
  • the copolymer obtained is ferromagnetic. Its magnetization at saturation M s is 0.17 emu / g and the coercive field is of the order of 100 Oersteds.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Soft Magnetic Materials (AREA)
  • Hard Magnetic Materials (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
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  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)

Abstract

Copolymer with magnetic properties in which the elementary unit comprises a first multivalent radical and a second multivalent radical originating from an aminoaromatic compound chosen from a substituted amino compound containing at least two condensed benzene rings, a substituted polycyclic compound containing at least the aniline unit in its structure, and a compound derived from aniline carrying a substituent linked to the ring by an ethynylidene or para-phenylene chain link, these compounds being taken in their reduced or oxidised form, the said first and the said second radical being joined together by a carbon-nitrogen bond and the nitrogen atoms being separated by a single aromatic ring, characterised in that the said first radical originates from a compound chosen from optionally substituted 1-naphthylamine taken in its reduced or oxidised form.

Description

La présente invention concerne un copolymère à propriétés magnétiques comportant des radicaux multivalents issus de composés aminoaromatiques. Elle s'étend en outre à son procédé de fabrication et aux applications de ce copolymère.The present invention relates to a copolymer with magnetic properties with multivalent radicals derived from aminoaromatic compounds. It also extends to its manufacturing process and the applications of this copolymer.

La demande de brevet européen EP-O 545 819 décrit des copolymères à propriétés magnétiques composés de deux groupes de composés aminoaromatiques, dont le premier est basé sur les dérivés par substitution de l'aniline dont la formule est:

Figure 00010001
European patent application EP-0 545 819 describes copolymers with magnetic properties composed of two groups of aminoaromatic compounds, the first of which is based on derivatives by substitution of aniline, the formula of which is:
Figure 00010001

Mais ce copolymère est de préparation longue et fastidieuse. En effet, le rendement de réaction est faible et le produit obtenu contient le copolymère et une quantité importante de monomère n'ayant pas réagit. L'extraction du copolymère nécessite donc l'emploi de différents mélanges de solvants et la répétition du lavage de nombreuses fois.But this copolymer is of long preparation and tedious. Indeed, the reaction yield is low and the product obtained contains the copolymer and an amount large amount of unreacted monomer. The extraction of copolymer therefore requires the use of different mixtures of solvents and repeating the wash many times.

Par ailleurs si l'homopolymérisation de l'aniline est couramment pratiquée, l'homopolymérisation de la 1-naphtylamine a fait l'objet de plusieurs tentatives sans succès. En particulier, l'électropolymérisation de la 1-naphtylamine a été étudiée par GENIES et LAPKOWSKI (Electrochim. Acta 32, 1223, 1987) en milieu eutectique NH4F/HF et n'a permis d'obtenir que le dimère formé par liaison carbone-carbone de la forme:

Figure 00010002
De plus, les conditions de synthèse utilisées par ces auteurs sont difficiles à mettre en oeuvre et peu envisageables industriellement.Furthermore, if the homopolymerization of aniline is commonly practiced, the homopolymerization of 1-naphthylamine has been the subject of several attempts without success. In particular, the electropolymerization of 1-naphthylamine was studied by GENIES and LAPKOWSKI (Electrochim. Acta 32, 1223, 1987) in an NH 4 F / HF eutectic medium and only allowed the dimer formed by bonding to be obtained. carbon-carbon of the form:
Figure 00010002
In addition, the synthesis conditions used by these authors are difficult to implement and difficult to envisage industrially.

En milieu acide aqueux (Electrochim. Acta 35(4), 741-748, 1990), l'électrooxydation de la 1-naphtylamine conduit à la formation d'un film conducteur peu électroactif, adhérent à l'électrode, composé de 1-naphthidine dimère formé par liaison carbone-carbone, et d'un produit formé par liaison carbone-azote dont il n'a pas été possible de déterminer s'il s'agit du dimère ou du polymère qui auraient pour formule, avec n supérieur ou égal à 1 :

Figure 00020001
Il n'est pas mentionné pour ce film de propriétés magnétiques.In an aqueous acid medium (Electrochim. Acta 35 (4), 741-748, 1990), the electrooxidation of 1-naphthylamine leads to the formation of a weakly electroactive conductive film, adherent to the electrode, composed of 1- naphthidine dimer formed by carbon-carbon bond, and of a product formed by carbon-nitrogen bond which it was not possible to determine if it is the dimer or the polymer which would have the formula, with n greater or equal to 1:
Figure 00020001
Magnetic properties are not mentioned for this film.

Le but de la présente invention est de procurer un copolymère présentant des propriétés magnétiques dont la synthèse soit aisément réalisable sur le plan industriel.The object of the present invention is to provide a copolymer with magnetic properties, the synthesis is easily achievable on an industrial level.

A cet effet, la présente invention propose un copolymère à propriétés magnétiques dont le motif élémentaire comporte un premier radical multivalent issu d'un composé choisi parmi la 1-naphtylamine éventuellement substituée prise sous sa forme réduite ou oxydée, et un second radical multivalent issu d'un composé aminoaromatique choisi parmi un composé aminé substitué comprenant au moins deux noyaux benzéniques condensés, un composé polycyclique substitué comprenant au moins le motif aniline dans sa structure, et un composé dérivé de l'aniline portant un substituant relié au noyau par un maillon éthynylidène ou paraphénylène, ces composés étant pris sous leur forme réduite ou oxydée, ledit premier et ledit second radical étant reliés entre eux par une liaison carbone-azote et les atomes d'azote étant séparés par un seul cycle aromatique.To this end, the present invention provides a copolymer with magnetic properties, the pattern of which elementary has a first multivalent radical from of a compound chosen from 1-naphthylamine optionally substituted taken in its reduced or oxidized form, and a second multivalent radical derived from an aminoaromatic compound chosen from a substituted amino compound comprising at least two condensed benzene rings, a polycyclic compound substituted comprising at least the aniline motif in its structure, and an aniline derivative compound carrying a substituent linked to the nucleus by an ethynylidene link or paraphenylene, these compounds being taken in their form reduced or oxidized, said first and said second radical being linked together by a carbon-nitrogen bond and the nitrogen atoms being separated by a single aromatic ring.

Ces deux radicaux sont de préférence reliés entre eux par des liaisons carbone-azote placées en position para du cycle aromatique, ce qui confère au polymère des propriétés ferromagnétiques. Lorsque le taux de liaisons situées en position ortho ne dépasse pas 15%, le ferromagnétisme est conservé. Les motifs élémentaires sont ainsi liés entre eux par des liaisons carbone-azote permettant de respecter dans la chaíne principale l'alternance -ϕ-N-ϕ-N-ϕ-N-ϕ-N- où ϕ désigne un cycle aromatique.These two radicals are preferably linked together by carbon-nitrogen bonds placed in the para position of aromatic cycle, which gives the polymer properties ferromagnetic. When the rate of links located in ortho position does not exceed 15%, ferromagnetism is preserved. The elementary patterns are thus linked together by carbon-nitrogen bonds allowing to respect in the main chain the alternation -ϕ-N-ϕ-N-ϕ-N-ϕ-N- where ϕ denotes an aromatic cycle.

Suivant les auteurs, la 1-naphtylamine est également appelée α-naphtylamine, naphtyl-1 amine, ou bien encore 1-aminonaphtalène. Sa formule est:

Figure 00030001
According to the authors, 1-naphthylamine is also called α-naphthylamine, naphthyl-1 amine, or even 1-aminonaphthalene. Its formula is:
Figure 00030001

Un même radical peut se présenter sous sa forme oxydée ou sous sa forme réduite, correspondant à l'équilibre

Figure 00030002
The same radical can be in its oxidized form or in its reduced form, corresponding to the equilibrium
Figure 00030002

Comme exemple de composé aminé substitué comprenant au moins deux noyaux benzèniques condensés on peut citer les composés suivants: 1-amino-5-bromonaphtalène, 1-amino-2-chloronaphtalène, N-phényl-1-naphtylamine, N-méthyl-N-phényl-1-naphtylamine, 1-amino-2-métoxynaphtalène, 1-méthylamino-2-métoxynaphtalène, 8-amino-2-métoxynaphtalène, ou bien encore 8-méthylamino-2-métoxynaphtalène. As an example of a substituted amino compound comprising minus two condensed benzene rings we can cite the following compounds: 1-amino-5-bromonaphthalene, 1-amino-2-chloronaphthalene, N-phenyl-1-naphthylamine, N-methyl-N-phenyl-1-naphthylamine, 1-amino-2-metoxynaphthalene, 1-methylamino-2-metoxynaphthalene, 8-amino-2-metoxynaphthalene, or else again 8-methylamino-2-metoxynaphthalene.

On définit un composé polycyclique (cf. HANDBOOK of CHEMISTRY and PHYSICS, 1978, page C-19, règle 32-12) comme un composé contenant un nombre de cycles égal au nombre de scissions nécessaires pour transformer ce composé cyclique en un composé linéaire. Un tel composé peut être par exemple: 1-amino-5,6,7,8-tétrahydronaphtalène, 1-amino-9-fluorénone, 1-(méthylamino)anthraquinone, 1-aminofluorène, 1-aminoanthraquinone.We define a polycyclic compound (cf. HANDBOOK of CHEMISTRY and PHYSICS, 1978, page C-19, rule 32-12) as a compound containing a number of cycles equal to the number of splits necessary to transform this cyclic compound into a linear compound. Such a compound can be by example: 1-amino-5,6,7,8-tetrahydronaphthalene, 1-amino-9-fluorenone, 1- (methylamino) anthraquinone, 1-aminofluorene, 1-aminoanthraquinone.

La présente invention a également pour objet un copolymère à propriétés magnétiques dont le motif élémentaire comporte le premier radical A et le second radical B sous leur forme oxydée ou réduite et répond à la formule générale:

Figure 00040001
où dans ledit radical A:

  • Ri (i= 1 à 4) représente un à quatre substituants, chaque substituant étant choisi parmi l'hydrogène, les radicaux chloro -Cl, bromo -Br, fluoro -F et iodo -I, un radical alkoxyalkyle (radical univalent dérivé d'un hydrocarbure acyclique linéaire) de la forme - (CH2)w - O - (CH2)v - CH3 avec w variant de 0 à 3 et v variant de 0 à 11 (v vaut de préférence 0 ou 1) et un radical aryle (radical univalent dérivé d'un hydrocarbure aromatique monocyclique) de la forme -ϕ, éventuellement substitués,
  • Rj (j= 1 ou 2) représente un ou deux substituants, chaque substituant étant choisi parmi l'hydrogène, les radicaux chloro, bromo, fluoro et iodo, un radical alcoxyalkyle et un radical aryle éventuellement substitués,
  • et R est un substituant choisi parmi l'hydrogène, un radical alkyle (radical univalent dérivé d'un hydrocarbure saturé acyclique linéaire) de la forme - (CH2)v - CH3 avec v variant de 0 à 11 (v vaut de préférence 0 ou 1) et un radical aryle éventuellement substitués,
dans ledit radical B:
  • Y est au moins un substituant donneur de proton susceptible de former un sel interne avec l'un des atomes d'azote dont il est séparé par un radical A, et dans ce cas le copolymère est principalement ferromagnétique,
lorsque le substituant Y forme des liaisons salines avec l'un des autres atomes d'azote, on obtient un copolymère qui est principalement paramagnétique,
  • et X est un radical multivalent issu d'un composé comprenant au moins un noyau aromatique susceptible de se placer dans la chaíne principale dudit copolymère, choisi parmi un composé comprenant au moins deux noyaux benzéniques condensés, un composé polycyclique comprenant au moins un noyau aromatique, un composé comprenant un noyau aromatique portant un maillon éthynylidène ou phénylène,
et dans ladite formule générale:
  • p et q sont des entiers aléatoires compris entre 1 et 3,
  • et n est un entier supérieur à 2, et le plus élevé possible.
The present invention also relates to a copolymer with magnetic properties, the elementary unit of which comprises the first radical A and the second radical B in their oxidized or reduced form and corresponds to the general formula:
Figure 00040001
where in said radical A:
  • R i (i = 1 to 4) represents one to four substituents, each substituent being chosen from hydrogen, chloro -Cl, bromo -Br, fluoro -F and iodo -I radicals, an alkoxyalkyl radical (univalent radical derived from '' a linear acyclic hydrocarbon) of the form - (CH 2 ) w - O - (CH 2 ) v - CH 3 with w varying from 0 to 3 and v varying from 0 to 11 (v is preferably 0 or 1) and an aryl radical (univalent radical derived from a monocyclic aromatic hydrocarbon) of the form -ϕ, optionally substituted,
  • R j (j = 1 or 2) represents one or two substituents, each substituent being chosen from hydrogen, chloro, bromo, fluoro and iodo radicals, an alkoxyalkyl radical and an optionally substituted aryl radical,
  • and R is a substituent chosen from hydrogen, an alkyl radical (univalent radical derived from a linear acyclic saturated hydrocarbon) of the form - (CH 2 ) v - CH 3 with v varying from 0 to 11 (v is preferably 0 or 1) and an optionally substituted aryl radical,
in said radical B:
  • Y is at least one proton donating substituent capable of forming an internal salt with one of the nitrogen atoms from which it is separated by a radical A, and in this case the copolymer is mainly ferromagnetic,
when the substituent Y forms salt bonds with one of the other nitrogen atoms, a copolymer is obtained which is mainly paramagnetic,
  • and X is a multivalent radical derived from a compound comprising at least one aromatic ring capable of being placed in the main chain of said copolymer, chosen from a compound comprising at least two condensed benzene rings, a polycyclic compound comprising at least one aromatic ring, a compound comprising an aromatic nucleus carrying an ethynylidene or phenylene link,
and in said general formula:
  • p and q are random integers between 1 and 3,
  • and n is an integer greater than 2, and the highest possible.

Les copolymères ferromagnétiques obtenus selon la présente invention ont une densité inférieure à 1,5 et donc l'avantage d'être plus légers que les autres produits ferromagnétiques utilisés généralement comme les métaux ou les ferrites.The ferromagnetic copolymers obtained according to the present invention have a density less than 1.5 and therefore the advantage of being lighter than other products ferromagnetics commonly used as metals or ferrites.

On entend par radical issu d'un composé comprenant au moins un noyau aromatique susceptible de se placer dans la chaíne principale, un radical susceptible de former deux liaisons entre un carbone du noyau aromatique et un atome d'azote.The term “radical derived from a compound comprising at minus an aromatic nucleus capable of being placed in the main chain, a radical capable of forming two bonds between a carbon of the aromatic nucleus and an atom nitrogen.

Lorsque X est issu d'un composé comprenant au moins deux noyaux benzéniques condensés, le substituant Y est de préférence porté par le noyau qui ne se trouve pas dans la chaíne principale. Le radical multivalent B est par exemple un radical de la forme:

Figure 00060001
When X is derived from a compound comprising at least two condensed benzene rings, the substituent Y is preferably carried by the ring which is not found in the main chain. The multivalent radical B is for example a radical of the form:
Figure 00060001

Lorsque X est issu d'un composé polycyclique comprenant au moins un noyau aromatique, le substituant Y est de préférence porté par le noyau qui ne se trouve pas dans la chaíne principale. Le radical multivalent B est par exemple un radical de la forme:

Figure 00060002
When X is derived from a polycyclic compound comprising at least one aromatic ring, the substituent Y is preferably carried by the ring which is not found in the main chain. The multivalent radical B is for example a radical of the form:
Figure 00060002

Lorsque X est issu d'un composé comprenant un noyau aromatique portant un maillon éthynylidène ou phénylène, le substituant Y est alors porté par le maillon. Le radical multivalent B est par exemple un radical de la forme:

Figure 00060003
When X is derived from a compound comprising an aromatic nucleus carrying an ethynylidene or phenylene link, the substituent Y is then carried by the link. The multivalent radical B is for example a radical of the form:
Figure 00060003

Le long de la chaíne du polymère, les motifs élémentaires peuvent comporter un nombre différent de radicaux A et B. De plus, compte-tenu des incertitudes opératoires, il peut arriver que localement p ou q soit exceptionnellement nul. Néanmoins la configuration la plus souhaitable est l'alternance rigoureuse des radicaux A et B.Along the polymer chain, the patterns elementary may have a different number of radicals A and B. In addition, taking into account the uncertainties it may happen that locally p or q is exceptionally nil. However, the most common configuration desirable is the rigorous alternation of the radicals A and B.

Selon un mode de réalisation préférentiel de la présente invention, les trois conditions suivantes sont remplies simultanément:

  • p = 1 et q = 1,
  • la liaison X-Y est rigide, certaines liaisons internes sont ainsi privilégiées,
  • Y est au moins un substituant choisi parmi un substituant sulfo -SO3H, phosphono -PO3H, et carboxy.-CO2H.
According to a preferred embodiment of the present invention, the following three conditions are fulfilled simultaneously:
  • p = 1 and q = 1,
  • the XY bond is rigid, certain internal bonds are thus privileged,
  • Y is at least one substituent chosen from a sulfo -SO 3 H, phosphono -PO 3 H, and carboxy.-CO 2 H substituent.

De préférence X est un radical multivalent issu d'un noyau naphtalène.Preferably X is a multivalent radical derived from a naphthalene core.

Avantageusement le radical B est un radical multivalent issu d'un acide choisi parmi les acides de CLEVE: acide 8-amino-2-naphtalènesulfonique (forme ) et acide 5-amino-2-naphtalènesulfonique (forme β), l'acide de LAURENT: acide 1-amino-5-naphtalènesulfonique, l'acide de PERI: acide 1-amino-8-naphtalènesulfonique, et les diacides: acide 1-naphtylamino-5,7-disulfonique et acide 1-naphtylamino-6,8-disulfonique. Dans ce cas, X est un noyau naphtalène et Y est un substituant sulfo -SO3H.Advantageously, the radical B is a multivalent radical derived from an acid chosen from CLEVE acids: 8-amino-2-naphthalenesulfonic acid (form ) and 5-amino-2-naphthalenesulfonic acid (form β), the acid of LAURENT: 1-amino-5-naphthalenesulfonic acid, PERI acid: 1-amino-8-naphthalenesulfonic acid, and the diacids: 1-naphthylamino-5,7-disulfonic acid and 1-naphtylamino-6,8- acid disulfonic. In this case, X is a naphthalene ring and Y is a sulfo substituent -SO 3 H.

Suivant les monomères utilisés, les copolymères selon l'invention peuvent être auto-dopés, mais dans le cas contraire on peut les doper afin de les rendre conducteurs. Les copolymères conducteurs selon la présente invention peuvent être utilisés pour le blindage de câbles qui y gagnent alors en souplesse et légèreté.Depending on the monomers used, the copolymers according to the invention can be self-doped but in the case on the contrary, they can be doped in order to make them conductive. Conductive copolymers according to the present invention can be used for shielding cables gain flexibility and lightness.

Avantageusement, un quart des radicaux A et/ou B se trouvent sous forme oxydée. Et de préférence, la moitié des radicaux B est sous la forme oxydée et l'autre moitié est sous la forme réduite, ceci favorise la formation d'un sel interne qui stabilise la structure et provoque l'apparition du ferromagnétisme.Advantageously, a quarter of the radicals A and / or B are found in oxidized form. And preferably, half of radicals B is in the oxidized form and the other half is in the reduced form, this promotes the formation of a salt internal which stabilizes the structure and causes the appearance of ferromagnetism.

Le procédé de fabrication du copolymère selon l'invention comprend

  • une première étape de copolymérisation en solution ou suspension d'un premier monomère qui est une 1-naphtylamine éventuellement substituée et d'un second monomère qui est un composé aminoaromatique substitué, et
  • une deuxième étape de purification et de séparation du milieu réactionnel dudit copolymère.
The process for manufacturing the copolymer according to the invention comprises
  • a first stage of solution or suspension copolymerization of a first monomer which is an optionally substituted 1-naphthylamine and of a second monomer which is a substituted aminoaromatic compound, and
  • a second step of purification and separation of the reaction medium from said copolymer.

La seconde étape inclue un lavage du copolymère obtenu par une solution faiblement basique comme par exemple une solution diluée de N-méthylformamide ou d'ammoniaque dans l'eau, suivi d'un lavage par un mélange d'eau et de méthanol. Cette étape a pour but d'éliminer les impuretés solubles du produit obtenu, et en particulier les résidus de monomères.The second step includes washing the copolymer obtained by a weakly basic solution such as for example a dilute solution of N-methylformamide or ammonia in water, followed by washing with a mixture of water and methanol. The purpose of this step is to remove impurities soluble in the product obtained, and in particular the residues of monomers.

Selon un mode de fabrication préférentiel, la copolymérisation est effectuée dans un milieu acide choisi parmi l'acide sulfurique, l'acide phosphorique, l'acide perchlorique, l'acide paratoluènesulfonique, l'acide formique, l'acide acétique et l'acide trifluoroacétique.According to a preferred manufacturing method, the copolymerization is carried out in a chosen acid medium among sulfuric acid, phosphoric acid, acid perchloric, paratoluenesulfonic acid, acid formic, acetic acid and trifluoroacetic acid.

En outre, le milieu acide peut contenir un solvant (cas d'une solution) ou un dispersant (cas d'une suspension) choisi de préférence parmi l'eau, les alcools comme le méthanol, les cétones comme l'acétone, les acides organiques comme l'acide acétique ou l'acide formique, et leurs mélanges.In addition, the acidic medium may contain a solvent. (case of a solution) or a dispersant (case of a suspension) preferably chosen from water, alcohols such as methanol, ketones like acetone, organic acids like acetic acid or formic acid, and their mixtures.

On effectue la copolymérisation en ajoutant lentement un agent oxydant à la suspension ou solution contenant le mélange des monomères. Selon une première forme d'exécution, l'agent oxydant est choisi parmi l'eau oxygénée H2O2 et l'acide iodique HIO3. Suivant le cas, l'agent oxydant peut être employé pur ou en solution.The copolymerization is carried out by slowly adding an oxidizing agent to the suspension or solution containing the mixture of monomers. According to a first embodiment, the oxidizing agent is chosen from hydrogen peroxide H 2 O 2 and iodic acid HIO 3 . Depending on the case, the oxidizing agent can be used pure or in solution.

Selon une seconde forme d'exécution, ledit agent oxydant est l'oxygène gazeux. According to a second embodiment, said agent oxidant is oxygen gas.

Selon une troisième forme d'exécution, on effectue la copolymérisation par oxydation en présence d'une électrode active sous tension. La voie électrochimique permet d'ajuster le taux d'oxydation du copolymère.According to a third embodiment, the oxidation copolymerization in the presence of an electrode active under power. The electrochemical route allows to adjust the oxidation rate of the copolymer.

Selon encore une autre forme d'exécution, la copolymérisation est effectuée par oxydation en présence d'un catalyseur qui permet d'accroítre le rendement de la réaction.According to yet another embodiment, the copolymerization is carried out by oxidation in the presence of a catalyst which makes it possible to increase the yield of the reaction.

Selon une première variante du mode de fabrication du copolymère, le procédé comporte en outre une troisième étape d'enrichissement en copolymère magnétique du produit obtenu à l'issue de la deuxième étape. On extrait du copolymère une phase soluble par mise en solution dans un solvant basique volatil, puis la solution est rapidement évaporée sous vide pour obtenir un résidu solide qui est traité thermiquement à environ 110°C sous vide pour régénérer les propriétés ferromagnétiques du copolymère. De préférence, le solvant est l'ammoniac liquide anhydre.According to a first variant of the method of manufacturing the copolymer, the process also includes a third step enrichment in magnetic copolymer of the product obtained at the end of the second stage. A copolymer is extracted from soluble phase by dissolving in basic solvent volatile, then the solution is quickly evaporated in vacuo to obtain a solid residue which is heat treated at about 110 ° C under vacuum to regenerate the properties ferromagnetics of the copolymer. Preferably, the solvent is anhydrous liquid ammonia.

Le traitement thermique a pour but de rompre les liaisons salines qui se sont créées entre le solvant basique et le substituant Y du copolymère, au profit de la formation d'autres liaisons salines entre le substituant Y et les sites amines et/ou imines du copolymère portés par le premier radical A. Ces nouvelles liaisons salines peuvent se créer au sein d'une même chaíne principale, ou bien entre plusieurs chaínes du copolymère. Ce sont ces nouvelles liaisons qui sont responsables de l'apparition des caractéristiques ferromagnétiques du copolymère en équilibrant les contraintes stériques très fortes, ce qui modifie profondément la structure électronique du copolymère.The purpose of the heat treatment is to break the salt bonds which have been created between the basic solvent and the substituent Y of the copolymer, for the benefit of the formation other salt bonds between the substituent Y and the amine and / or imine sites of the copolymer carried by the first radical A. These new salt bonds can be create within the same main chain, or between several chains of the copolymer. These are the news bonds that are responsible for the appearance of ferromagnetic characteristics of the copolymer in balancing the very strong steric constraints, which profoundly changes the electronic structure of the copolymer.

Selon une seconde variante du mode de fabrication, le procédé comporte en outre une troisième étape d'enrichissement en copolymère magnétique du produit obtenu à l'issue de la deuxième étape. On extrait du copolymère une phase soluble par mise en solution dans un solvant basique volatil, puis on précipite la phase soluble en acidifiant la solution ce qui provoque la décomposition du sel d'ammonium du copolymère qui s'est formé. Le copolymère obtenu est principalement amorphe. Il se présente sous forme de gel à l'état humide et de blocs poreux à l'état sec. En milieu basique, sa couleur est bleu violacé, il devient vert foncé en milieu acide.According to a second variant of the manufacturing method, the method further includes a third step enrichment in magnetic copolymer of the product obtained at the end of the second stage. A copolymer is extracted from soluble phase by dissolving in basic solvent volatile, then the soluble phase is precipitated by acidifying the solution which causes the ammonium salt to decompose of the copolymer which has formed. The copolymer obtained is mainly amorphous. It comes in the form of a gel the wet state and porous blocks in the dry state. In the middle basic, its color is purplish blue, it becomes dark green in an acid medium.

De préférence, le solvant est une solution d'une base volatile dans un solvant organique, comme par exemple une solution ammoniacale alcoolique.Preferably, the solvent is a solution of a base volatile in an organic solvent, such as alcoholic ammonia solution.

Selon encore une autre variante, la solidification (séchage ou précipitation) de la phase soluble est effectuée sous champ magnétique ou/et électrique.According to yet another variant, solidification (drying or precipitation) of the soluble phase is carried out under magnetic or / and electric field.

Le copolymère selon l'invention peut être utilisé sous des formes différentes. Selon un premier mode de mise en oeuvre, le copolymère est mis en suspension ou en solution pour former un ferro-fluide. Confiné dans un champ magnétique, il peut être utilisé par exemple comme joint magnétique. Il permet aussi l'obtention d'adhésifs.The copolymer according to the invention can be used under different shapes. According to a first mode of implementation work, the copolymer is suspended or in solution to form a ferro-fluid. Confined in a field magnetic, it can be used for example as a seal magnetic. It also makes it possible to obtain adhesives.

Selon un autre mode de mise en oeuvre, le copolymère portant un substrat Y donneur de proton est salifié par une base volumineuse comme l'hydroxyde de tétraalkylammonium. Cette opération a pour but de rendre le polymère fusible pour permettre sa mise en forme en couche mince.According to another embodiment, the copolymer carrying a proton donor substrate Y is salified by a bulky base such as tetraalkylammonium hydroxide. The purpose of this operation is to make the polymer fusible to allow it to be shaped into a thin layer.

Dans ce cas, l'épaisseur de la couche déposée peut être extrêmement faible de l'ordre du nanomètre, ce qui permet son application dans diverses techniques de microscopie: les microscopes tunnel, les microscopes à force atomique, les microscopes en champ proche et les microscopes à onde évanescente.In this case, the thickness of the deposited layer can be extremely small in the nanometer range, which allows its application in various techniques of microscopy: tunnel microscopes, force microscopes atomic, near field microscopes and microscopes with evanescent wave.

Selon une variante, le copolymère est déposé en plusieurs couches minces séparées par une couche d'un matériau magnétique différent dudit copolymère et choisi parmi un matériau diamagnétique, un matériau ferromagnétique, un matériau ferrimagnétique et un matériau paramagnétique. According to a variant, the copolymer is deposited in several thin layers separated by a layer of a magnetic material different from said copolymer and chosen among a diamagnetic material, a material ferromagnetic, a ferrimagnetic material and a material paramagnetic.

Les copolymères de l'invention se prêtent à de nombreuses applications du fait de leurs fortes propriétés magnétiques. On peut les déposer en couche mince sur des supports, comme le polyéthylène, le polychlorure de vinyle, le polyméthacrylate de méthyle, les polycarbonates, les résines époxydes. Ils peuvent à ce titre servir de support d'information écrite, notamment pour billets ou cartes bancaires, mais également comme supports photographiques ou radiographiques.The copolymers of the invention lend themselves to numerous applications due to their strong properties magnetic. They can be deposited in a thin layer on supports, such as polyethylene, polyvinyl chloride, polymethyl methacrylate, polycarbonates, epoxy resins. As such, they can serve as a support written information, especially for tickets or cards banking, but also as photographic supports or radiographic.

Ces copolymères trouvent des applications dans les dispositifs hyperfréquences, notamment les guides d'ondes, les circulateurs, les polariseurs, les absorbants, les blindages et les filtres. Ils conviennent également dans des systèmes optiques, notamment les écrans d'affichage, les systèmes dichroïques, de diffraction ou d'absorption de rayons X, ou de multiplexage sur fibres optiques. De manière plus générale, ils sont applicables dans les systèmes électro-magnéto-optiques et électro-magnéto-résistifs.These copolymers find applications in microwave devices, in particular waveguides, circulators, polarizers, absorbents, shields and filters. They are also suitable in optical systems, including display screens, dichroic, diffraction or absorption systems of X-rays, or multiplexing on optical fibers. So more general they are applicable in systems electro-magneto-optical and electro-magneto-resistive.

Un ajustement de leurs propriétés magnétiques est possible permettant leur utilisation dans des dispositifs de contrôle du magnétisme. Cet ajustement peut être réalisé par voie chimique à l'aide d'une structure catalytique, par voie électrochimique, par voie mécanique au moyen de la pression, notamment à l'aide d'un matériau piézoélectrique, ou par voie thermique.An adjustment of their magnetic properties is possible allowing their use in devices magnetism control. This adjustment can be made by chemical route using a catalytic structure, via electrochemical, mechanically by means of pressure, in particular using a piezoelectric material, or by thermal route.

Ces copolymères sont aussi utilisables dans l'appareillage électrique, tels que moteurs, transformateurs, inducteurs, où ils permettent l'emploi de matériaux magnétiques non métalliques.These copolymers can also be used in electrical equipment, such as motors, transformers, inductors, where they allow the use of non-metallic magnetic materials.

D'autres caractéristiques et avantages de la présente invention apparaitront à la lecture des exemples suivants de modes de réalisation, donnés bien entendu à titre illustratif et non limitatif, en référence au dessin annexé sur lequel:

  • la figure 1 représente la variation du signal magnétique M en fonction de la variation cyclique du champ H pour un exemple de copolymère ferromagnétique selon l'invention,
  • la figure 2 est analogue à la figure 1 pour un autre exemple de copolymère ferromagnétique selon l'invention.
Other characteristics and advantages of the present invention will appear on reading the following examples of embodiments, given of course by way of nonlimiting illustration, with reference to the appended drawing in which:
  • FIG. 1 represents the variation of the magnetic signal M as a function of the cyclic variation of the field H for an example of ferromagnetic copolymer according to the invention,
  • Figure 2 is similar to Figure 1 for another example of a ferromagnetic copolymer according to the invention.

Sur les figures 1 et 2, le champ magnétique H en Oersteds est donné en abcisse, et en ordonnée le signal magnétique M en unités relatives (Unités Electro-Magnétiques: emu) pour la masse de l'échantillon de copolymère analysé.In Figures 1 and 2, the magnetic field H in Oersteds is given on the abscissa, and on the ordinate the signal magnetic M in relative units (Units Electro-Magnetic: emu) for the mass of the sample copolymer analyzed.

EXEMPLE 1EXAMPLE 1

A une suspension de 0,64g de 1-naphtylamine et de 1g d'acide 5-amino-2-naphtalènesulfonique (forme β de l'acide de CLEVE) dans 10ml d'acide acétique pur, on ajoute 0,8ml d'une solution aqueuse à 50% en poids de peroxyde d'hydrogène H2O2. La suspension est agitée pendant 16 heures à température ambiante, puis elle est centrifugée. Le culot de centrifugation contient le copolymère recherché ainsi qu'une forte proportion du monomère de départ.To a suspension of 0.64 g of 1-naphthylamine and 1 g of 5-amino-2-naphthalenesulfonic acid (β form of CLEVE acid) in 10 ml of pure acetic acid, 0.8 ml of a 50% by weight aqueous solution of hydrogen peroxide H 2 O 2 . The suspension is stirred for 16 hours at room temperature, then it is centrifuged. The centrifugation base contains the desired copolymer as well as a high proportion of the starting monomer.

La séparation du copolymère s'obtient par redispersion du culot à plusieurs reprise dans un mélange aqueux de solvants, suivie d'une récupération par centrifugation. Quelques lavages sont effectués dans un mélange équivolumique d'eau et de méthanol, puis on réalise au moins deux lavages dans une solution à 50% de N-méthylformamide dans un mélange eau-méthanol, afin d'éliminer l'acide 5-amino-2-naphtalènesulfonique. Enfin on termine les lavages avec des solvants contenant très peu d'eau: solution à 25% en volume d'acide acétique dans le méthanol, diéthyloxyde.The separation of the copolymer is obtained by redispersion of the pellet several times in an aqueous mixture of solvents, followed by recovery by centrifugation. Some washes are done in a mixture equivolumique of water and methanol, then we realize at least two washes in a 50% solution of N-methylformamide in a water-methanol mixture, in order to remove the acid 5-amino-2-naphthalenesulfonic. Finally we finish the washes with solvents containing very little water: 25% solution by volume of acetic acid in methanol, diethyloxide.

Aprés un séchage sous vide primaire, on obtient 33mg de poudre noire, soit un rendement de 2%. Le copolymère conducteur autodopé obtenu est représenté par la formule générale:

Figure 00130001
After drying under primary vacuum, 33 mg of black powder are obtained, ie a yield of 2%. The self-doped conductive copolymer obtained is represented by the general formula:
Figure 00130001

Les mesures de magnétisme sont effectuées à une température de 300K sur un magnétomètre à gradient de champ alternatif. Le résultat se présente sous la forme de la courbe 1 de la figure 1 qui montre l'évolution de l'aimantation M en fonction du champ magnétique H appliqué à l'échantillon. Cette courbe est caractéristique d'un composé ferromagnétique et présente une hystérésis. L'aimantation à saturation Ms est de 0,12emu/g et le champ coercitif est de l'ordre de 100 Oersteds.The magnetism measurements are carried out at a temperature of 300K on an alternating field gradient magnetometer. The result is in the form of curve 1 in FIG. 1 which shows the evolution of the magnetization M as a function of the magnetic field H applied to the sample. This curve is characteristic of a ferromagnetic compound and exhibits hysteresis. The magnetization at saturation M s is 0.12 emu / g and the coercive field is of the order of 100 Oersteds.

EXEMPLE 2EXAMPLE 2

A une suspension agitée de 3,2g de 1-naphtylamine et 5g d'acide 5-amino-2-naphtalènesulfonique dans 20ml d'acide acétique anhydre, on ajoute goutte à goutte pendant 2 heures, un mélange constitué de 4ml d'une solution aqueuse à 50% en poids de peroxyde d'hydrogène H2O2 et de 10ml d'acide acétique pur. La réaction s'effectue à température ambiante et se poursuit sous agitation environ une heure après la fin de l'addition du mélange.To a stirred suspension of 3.2 g of 1-naphthylamine and 5 g of 5-amino-2-naphthalenesulfonic acid in 20 ml of anhydrous acetic acid, a mixture consisting of 4 ml of a solution is added dropwise over 2 hours. aqueous at 50% by weight of hydrogen peroxide H 2 O 2 and 10 ml of pure acetic acid. The reaction is carried out at room temperature and continues with stirring about one hour after the end of the addition of the mixture.

La suspension est alors lavée et séchée comme décrit dans l'exemple 1 et on obtient 193mg d'une poudre presque noire, soit un rendement de 2,7%.The suspension is then washed and dried as described in example 1 and we get 193mg of a powder almost black, representing a yield of 2.7%.

Les mesures de magnétisme sont effectuées de la même manière que dans l'exemple 1. Le résultat se présente sous la forme de la courbe 2 de la figure 2. Cette courbe est caractéristique d'un composé ferromagnétique et présente une hystérésis. L'aimantation à saturation Ms est de 0,07emu/g et le champ coercitif est de l'ordre de 100 Oersteds. The magnetism measurements are carried out in the same manner as in Example 1. The result is in the form of curve 2 in FIG. 2. This curve is characteristic of a ferromagnetic compound and has hysteresis. The magnetization at saturation M s is 0.07emu / g and the coercive field is of the order of 100 Oersteds.

EXEMPLE 3EXAMPLE 3

A une solution agitée de 0,64g de 1-naphtylamine et de 1g d'acide 5-amino-2-naphtalènesulfonique dans 20ml d'acide sulfurique à 95%, on ajoute goutte à goutte pendant une demi-heure, un mélange constitué de 0,8ml d'une solution aqueuse à 50% en poids de peroxyde d'hydrogène H2O2 et de 10ml d'acide sulfurique à 95%. La réaction s'effectue à température ambiante et se poursuit sous agitation environ 20mn après la fin de l'addition du mélange. La solution est alors versée dans 150ml d'eau à 0°C afin de provoquer la précipitation du copolymère.To a stirred solution of 0.64 g of 1-naphthylamine and 1 g of 5-amino-2-naphthalenesulfonic acid in 20 ml of 95% sulfuric acid, a mixture consisting of 0.8 ml of a 50% by weight aqueous solution of hydrogen peroxide H 2 O 2 and 10 ml of 95% sulfuric acid. The reaction is carried out at room temperature and continues with stirring approximately 20 minutes after the end of the addition of the mixture. The solution is then poured into 150 ml of water at 0 ° C in order to cause precipitation of the copolymer.

La suspension est alors lavée et séchée comme décrit dans l'exemple 1 et on obtient 330mg d'une poudre presque noire, soit un rendement de l'ordre de 20%.The suspension is then washed and dried as described in example 1 and we get 330mg of a powder almost black, or a yield of the order of 20%.

Les mesures de magnétisme sont effectuées de la même manière que dans l'exemple 1. Le copolymère obtenu est ferromagnétique. Son aimantation à saturation Ms est de 0,07emu/g et le champ coercitif est de l'ordre de 100 Oersteds.The magnetism measurements are carried out in the same manner as in Example 1. The copolymer obtained is ferromagnetic. Its magnetization at saturation M s is 0.07emu / g and the coercive field is of the order of 100 Oersteds.

EXEMPLE 4EXAMPLE 4

A une suspension agitée de 0,64g de 1-naphtylamine et d'un excès (5g) d'acide 5-amino-2-naphtalènesulfonique dans une solution de 5ml d'acide perchlorique à 70% dans 10ml d'eau, on ajoute 0,7ml de peroxyde d'hydrogène H2O2 à 50%. La réaction s'effectue à température ambiante et se poursuit sous agitation environ cinq heures après la fin de l'addition de l'oxydant.To a stirred suspension of 0.64 g of 1-naphthylamine and an excess (5 g) of 5-amino-2-naphthalenesulfonic acid in a solution of 5 ml of 70% perchloric acid in 10 ml of water, the following is added 0.7ml of hydrogen peroxide H 2 O 2 at 50%. The reaction is carried out at room temperature and continues with stirring about five hours after the end of the addition of the oxidant.

La suspension est alors lavée et séchée comme décrit dans l'exemple 1 et on obtient 65mg d'une poudre presque noire, soit un rendement de 4% par rapport à la quantité stoéchiométrique des deux monomères. The suspension is then washed and dried as described in example 1 and we get 65mg of a powder almost black, i.e. a yield of 4% compared to the quantity stoichiometric of the two monomers.

Les mesures de magnétisme sont effectuées de la même manière que dans l'exemple 1. Le copolymère obtenu est ferromagnétique. Son aimantation à saturation Ms est de 0,17emu/g et le champ coercitif est de l'ordre de 100 Oersteds.The magnetism measurements are carried out in the same manner as in Example 1. The copolymer obtained is ferromagnetic. Its magnetization at saturation M s is 0.17 emu / g and the coercive field is of the order of 100 Oersteds.

Claims (24)

  1. A magnetic copolymer with a structural unit comprising:
    a first multivalent radical derived from a compound selected from 1-naphthylamine, which may be substituted, in its reduced or oxidized form; and
    a second multivalent radical derived from an aminoaromatic compound selected from a substituted amine containing at least two condensed benzene rings, a substituted polycyclic compound containing at least one aniline unit in its structure, and a compound derived from aniline substituted on the nucleus by an ethynylidene or paraphenylene side chain, these compounds being in their reduced or oxidized forms.
    said first and said second radical being coupled together by a carbon-nitrogen bond and the nitrogen atoms being separated by a single aromatic ring.
  2. A copolymer according to claim 1, wherein said structural unit contains a first radical A and a second radical B in the oxidized or reduced form having the following general formula:
    Figure 00290001
       where, in said radical A:
    Ri (i = 1 to 4) represents one to four substituents, each substituent being selected from hydrogen, chloride, bromide, fluoride and iodide radicals, an alkoxyalkyl radical and an aryl radical, which may be substituted,
    Rj (j = 1 or 2) represents one or two substituents, each substituent being selected from hydrogen, chloride, bromide, fluoride and iodide radicals, an alkoxyalkyl radical and an aryl radical which may be substituted, and
    R is a substituent selected from hydrogen, an alkyl radical and an aryl radical which may be substituted,
       in said radical B:
    Y is at least one proton-donating substituent which can form an internal salt with one of the nitrogen atoms from which it is separated by radical A, and
    X is a multivalent radical derived from a compound containing at least one aromatic nucleus which can form part of the main chain of said copolymer, selected from a compound containing at least two condensed benzene nuclei, a polycyclic compound containing at least one aromatic nucleus, and a compound containing an aromatic nucleus with an ethynylidene or phenylene side chain,
       and in said general formula:
    p and g are random whole numbers between 1 and 3,
    and n is a whole number larger than 2 and as large as possible.
  3. A copolymer according to claim 2, wherein the following three conditions are simultaneously satisfied:
    p = 1 and q = 1,
    the X-Y bond is rigid,
    Y is at least one substituent selected from sulfo, phosphono and carboxy substituents.
  4. A copolymer according to claim 2 or claim 3, wherein X is a multivalent radical derived from a compound containing a naphthalene nucleus.
  5. A copolymer according to any one of claims 2 to 4, wherein said radical B is a multivalent radical derived from an acid selected from:
    8-amino-2-naphthalenesulfonic acid,
    5-amino-2-naphthalenesulfonic acid,
    1-amino-5-naphthalenesulfonic acid,
    1-amino-8-naphthalenesulfonic acid,
    1-naphthylamino-5,7-disulfonic acid, and
    1-naphthylamino-6,8-disulfonic acid.
  6. A copolymer according to any one of claims 2 to 5, wherein one fourth of said radicals A and/or B are in the reduced form.
  7. A copolymer according to claim 6, wherein half of said radicals B are in the oxidized form and the other half are in the reduced form.
  8. A method of manufacture of a copolymer according to any one of claims 1 to 7, essentially consisting in:
    a first copolymerization step, in solution or suspension, of a first monomer, which is a 1-naphthylamine which may be substituted, and a second monomer which is a substituted aminoaromatic compound, and
    a second step for purification and separation of the reaction medium from said copolymer composed of a first washing using a slightly basic aqueous solution, and a second washing using a solution of water and methanol.
  9. A method of manufacture according to claim 8, wherein said copolymerization is carried out in an acidic medium selected from sulfuric acid, phosphoric acid, perchloric acid, paratoluenesulfonic acid, formic acid, acetic acid, and trifluoroacetic acid.
  10. A method of manufacture according to claim 8, wherein said acid medium further contains a solvent or dispersing agent selected from water, alcohols, ketones, organic acids, and mixtures thereof.
  11. A method of manufacture according to claim 8, wherein said copolymerization is carried out by slow addition of an oxidizing agent to the suspension or solution containing said first and said second monomer.
  12. A method of manufacture according to claim 11, wherein said oxidizing agent is selected from hydrogen peroxide and iodic acid.
  13. A method of manufacture according to claim 11, wherein said oxidizing agent is gaseous oxygen.
  14. A method of manufacture according to claim 8, wherein said copolymerization is carried out by oxidation in the presence of an active current carrying electrode.
  15. A method of manufacture according to claim 8, wherein said copolymerization is carried out by oxidation in the presence of a catalyst.
  16. A method of manufacture according to claim 8, further including a third step comprising
    extracting a soluble phase from the copolymer by dissolution in a volatile basic solvent,
    then rapidly vacuum evaporating the solution to obtain a solid residue, and
    heat treating said solid residue.
  17. A method of manufacture according to claim 16, wherein said solvent is anhydrous liquid ammonia.
  18. A method of manufacture according to claim 8, further including a third step comprising:
    extracting a soluble phase from said copolymer by dissolution in a volatile basic solvent,
    then precipitating said soluble phase by acidifying said solution.
  19. A method of manufacture according to claim 18, wherein said solvent is a solution of a volatile base in an organic solvent.
  20. A method of manufacture according to claim 16 or claim 18, characterized in that said soluble phase is solidified in a magnetic and/or electrical field.
  21. A method of using a copolymer according to claim 1, wherein said copolymer is suspended or dissolved to form a ferro-fluid.
  22. A method of using a copolymer according to claim 1, wherein said copolymer is deposited in a thin layer of nanometric thickness.
  23. A method according to claim 22, wherein said copolymer is deposited in several thin layers separated by a layer of magnetic material different to said copolymer.
  24. The use of a copolymer according to claim 1 as a photographic or radiographic medium, in microscopes, in ultrahigh-frequency equipment, in magnetism control apparatus, in optical systems, in electro-magneto-optical systems, or in electro-magneto-resistive systems.
EP94402130A 1993-09-28 1994-09-23 Copolymer with magnetic properties, its method of fabrication and its uses Expired - Lifetime EP0645414B1 (en)

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FR9311504A FR2710648B1 (en) 1993-09-28 1993-09-28 Copolymer with magnetic properties, its manufacturing process and its applications.
FR9311504 1993-09-28

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EP0645414B1 true EP0645414B1 (en) 1998-10-21

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FR2732966B1 (en) * 1995-04-14 1997-05-16 Alsthom Cge Alcatel ORGANIC MOLECULAR COMPOUND WITH FERROMAGNETIC PROPERTIES AND PROCESS FOR PRODUCING THE SAME
FR2751780B1 (en) 1996-07-26 1999-02-19 Gemplus Card Int MATERIALS WITH FERROMAGNETIC PROPERTIES COMPRISING ORGANIC MOLECULES WITH MAGNETIC PROPERTIES AND THEIR MANUFACTURING METHODS
JP5795495B2 (en) * 2010-06-04 2015-10-14 住友化学株式会社 Modified aromatic amine, redox catalyst, electrode catalyst for fuel cell and fuel cell

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US5164465A (en) * 1988-05-13 1992-11-17 Ohio State University Research Foundation Sulfonated polyaniline salt compositions, processes for their preparation and uses thereof
EP0455224B1 (en) * 1990-05-02 1996-08-14 Tomoegawa Paper Co. Ltd. Polyaniline derivatives and their production process
FR2684677B1 (en) * 1991-12-06 1994-01-21 Alcatel Alsthom Cie Gle Electric COPOLYMERS WITH MAGNETIC PROPERTIES COMPRISING AMINO AROMATIC GROUPS AND PREPARATION METHOD AND APPLICATIONS THEREOF.

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JPH07179600A (en) 1995-07-18
FI107805B (en) 2001-10-15
CA2133045C (en) 2001-07-17
CA2133045A1 (en) 1995-03-29
DE69414065D1 (en) 1998-11-26
ATE172478T1 (en) 1998-11-15
ES2125424T3 (en) 1999-03-01
DE69414065T2 (en) 1999-05-06
FR2710648A1 (en) 1995-04-07
FR2710648B1 (en) 1995-11-10
US5635582A (en) 1997-06-03
FI944444A (en) 1995-03-29
FI944444A0 (en) 1994-09-26
EP0645414A1 (en) 1995-03-29

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